Safety



PATENTED SEPT. 20, 1904.

H. J. 000K. SAFETY APPLIANCE FOR ELEVATORS.

APPLICATION FILED JAN. 27. 1904.

NO MODEL.

g ktt Eg g EE EE Patented September 20, 1904.

EEICE.

PATENT HENRY J. COOK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF THREE-FOURTHS TO WILLIAM S. DILKS AND FRANK A. SHERWIN, OF MULLIOA HILL, NEW JERSEY, AND DAVID BARTON, OF PHILA- DELPHIA, PENNSYLVANIA.

SAFETY APPLIANCE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 770,560, dated September 20, 1904. Application filed January 27, 1904. Serial No. 190,76'7- (N0 model.)

To all whom, it may concern:

Be it known that I, HENRY J. CooK, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented new and useful Improvements in Safety Appliances for Elevators, of which the following is a specification.

My invention consists of an elevator having a safety appliance of such construction that in the event of accidents whereby the car runs away said car will soon be controlled and its descent prevented, the novel features of the same being hereinafter described, and pointed out in the claims that follow the specification.

Figure 1 represents a perspective view of an elevator embodying my invention. Fig. 2 represents a top or plan view of a portion, in the present case, at the left-hand side of Fig. 1. Fig. 3 represents a horizontal section of a portion on line m m, Fig. 1. Fig. 4: represents a side-view of a detached portion.

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, A designates an elevator-car which, excepting the features of my invention applied thereto, is of usual construction.

B designates a rock-shaft which has its bearings in ears O on said car and carries the arms D, which project angularly therefrom and are connected by the cables, cords, or chains E with the dogs F, the latter being mounted on the car A and provided with noses Gr, one at each end, so as to engage with the teeth on opposite sides of the vertical racks H, the latter being stationary and secured in the elevator-shaft in any suitable manner.

J designates springs which are connected with the car A and the dogs F, so as to force the latter into engagement with the racks H, it being noticed that owing to the primary position of the arms D the connections E retain said dogs clear of said racks, their actions being superior to those of said springs, as shown in Fig. 1.

Connected with the shaft B are the ears K and the dog L, the latter freely entering the eye M on the top of the car, said dog being held in such position by the pin N, which passes horizontally through the ears K and the adjacent portion of said dog, as shown in Figs. 1 and 3. Connected with the head of said pin are the cable, cord, or chain P, which pass over the pulley Q .on the shaft R, the pulley S on the shaft T, the guide-pulley U on the shaft V, and the pulley W on the shaft X, said shafts being properly mounted in the elevator-shaft or adjacent thereto, said cable, cord, or chain being connected with the car A, preferably the lower portion thereof, and moving with the same in the up and down motions thereof. It will be noticed that the shaft R carries the pulley Y, over which passes the elevator-cable Z, said shaft having also connected with it the crank-wheel A, to whose wrist-pin B is attached the piston-rod O of the air-pump D, the latter being suitably supported in the elevator-shaft adjacent thereto and having a nozzle E for the discharge of air from the barrel thereof. On the side of the pulley S is the ratchet F, adjacent to which is the pawl G, which is mounted on the shaft H, on which latter is also mounted the weighted blade J, which is so hung that its tendency'is primarily to hold the pawl Or from the ratchet F, as most plainly seen in Fig. 2.

The blade J presents its face to the nozzle Eof the air-pump, so as to receive the impact of air from the latter, which impact is, however, under ordinary circumstances too light to materially disturb said blade. Should, however, from any cause the car be permitted or caused to run away, the pump D will be rapidly operated and cause a heavy and continuous blast or volume of air to be injected against the blade J, so as to impel the latter toward the ratchet F and place the pawl Or in engagement with the latter, thus locking said ratchet and likewise the pulley S, so

that the cable P is checked or stopped in its motion, whereby the pin N is withdrawn from the eyes K and dog L, thus freeing the latter sufficiently to be loose in the eye M, so that the rock-shaft B is permitted to turn down to a sufficient extent when the cables E lower and the springs J become operative, causing the dogs G to move toward and engage with the racks H, thus stopping the car. In order to relieve the car and connected parts of strain or shock due to the sudden stoppage of the former, the dogs F are mounted on the movable heads or travelers J, the latter being freely fitted on and guided by the rods K, which are connected with the brackets L on the sides of the car. Interposed between the upper-brackets L and said heads J are the springs M, which form cushions against which said heads are adapted to bear, so that in the event of the engagement of the dogs with the rack-bars and consequent sudden stoppage of the car the heads J yield, subject to the pressure of the springs M, thus preventing fracture of or otherinjury to the parts in question.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A safety appliance for an elevator comprisingaslide mounted on a car, adog pivoted to said slide and provided with a nose at each end, a toothed bar adapted to be engaged on opposite sides by said dog, and means moving with the car for holding said dog out of operative position.

2. In a safety appliance for an elevator, a dog with a nose at each end, a double rack-bar for the noses, and means moving with the car for holding said dog out of operative position.

3. In a safety appliance for an elevator, a double-nosed dog, a sliding head-on which the same is pivoted, a way supporting said eye, and means moving with the car for holding said dog out of operative position.

4. In a safety appliance for an elevator, a double-nosed dog, a sliding head on which the same is pivoted, asupport for said head, means moving with the car for holding said dog out of operative position and a cushion-spring interposed between said head and a fixed part of the car.

5. A safety appliance for an elevator comprising a slide mounted on a car, a dog pivoted to said slide and provided with a nose at each end, a toothed bar adapted to be engaged on opposite sides by said dog, means moving with the car for holding said dog out of operative position and a spring connected with said dog and said slide for throwing the dog into double engagement with said bar.

6. In a safety appliance for an elevator, a toothed bar, a double-nosed dog on a car, a sliding bearing on which said dog is mounted, means moving with the car for holding said dog out of operative position, means for forcing said dog into engagement with said bar and a cushion-spring for said bearing.

7. In a safety appliance for an elevator, a duplex toothed bar, a dog pivotally mounted on a car and provided with noses adapted to be engaged with the opposite toothed faces of said bar, a portion movable relatively of the car, means connecting said portion and said dog, means operated by the car-moving apparatus for moving said portion to release said dog and a spring connected with said dog for engaging same with said bar.

8. A safety appliance for an elevator comprising a slide mounted on a car, a dog pivoted to said slide and provided with a nose at each end, a toothed bar adapted to be en gaged on opposite sides by said dog, means 'for holding said dog out of operative position and a cushion interposed between said slide and a fixed member of the car.

9. In a safety appliance for an elevatorcar, a coupling for the car and a member of the safety appliance, an air-blast device adapted to be operated by the running of the car, and means adapted to be operated by the blast for withdrawing said coupling and causing the safety appliance proper to be operative.

10. In a safety appliance for an elevatorcar, a pulley, a ratchet on said pulley, a pawl primarily held from said ratchet, and aplate connected with said pawl in combination with an air-blast device which is operative by the running away of the car whereby said pawl is blown into engagement with said ratchet.

11. In a safety appliance for an elevatorcar, an air-pumping device, a movable plate in-the path of air discharged from said device, a belt connected at one end with the car, a pulley around which said belt passes, a ratchet on said pulley, a pawl on said plate, means for rapidly operating said pumping device by the running away of the car, a detachable coupling for the other end of said belt with a member of the car, a rock-shaft carrying said coupling, a rack in the elevator-shaft, a dog on the car adapted to engage said rack, a spring for forcing said dog into engagement with said rack, and a connection for said rock-shaft and said dog for holding the latter from said rack.

12. In a safety appliance for an elevator, a car, a lock for said car, a detachable connection for said car and look, a pneumatic device adapted to be operated by the movement of said car, and means adapted to be operated by air from said device for releasing said connection when the car runs away.

13. In a safety appliance for an elevator, a

car, a lock for said car, a detachable connection for said car and lock, a pneumatic device adapted to be operated by the movement of said car, a plate adapted to receive'the impact of air from said device, a pawl and ratchet, said pawl being connected with said plate, a

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pulley connected with said ratchet and a cable adapted to pass around said pulley and being attached to said connection, whereby when the car runs away said connection will be released.

14. In a safety appliance for an elevator, a car-locking device, a pneumatic device actuated by the car-moving apparatus, means for normally holding said locking device out of operative position, and means operative by air from said pneumatic device for releasing said holding means when the speed of the car is abnormally decreased.

15. In a safety appliance for an elevator, a car-locking device, means for holding said locking device out of operative position, a pneumatic device actuated by the car-moving apparatus, a plate adapted to receive the impact of air from said pneumatic device, a pawl attached to said plate, apulley having a ratchet in the path of said pawl, a cable on said pulley and attached to said holding means and operative to release said locking device when themovement of said pneumatic device is abnormally accelerated.

16. A safety appliance for an elevator comprising a stationary rack, a dog secured to the car, means moving with the car for normally holding said dog out of operative position, and an air-pump actuated by the car-moving ap- I paratus and operative to release said holding means when the speed of the car is abnormally increased.

17 A safety appliance for an elevator comprising a stationary rack, a dog secured to the car, a rock-shaft on the car, a connection between said shaft and said dog for holding said dog out of operative position, a cable attached to said shaft and pneumatic means operative through said cable to rock said shaft when the speed of the car is abnormallyincreased,whereby said dog is released for engagement with said rack.

18. A safety appliance for an elevator comprising a stationary rack, a dog secured to the car, a rock-shaft on the car, a connection between said shaft and said dog for holding said dog out of operative position, a cable attached to said shaft and pneumatic means actuated by the car-moving apparatus and operative when the speed of the car is abnormally increased for checking the movement of said cable, whereby said shaft is rocked and said dog released for engagement with said rack.

HENRY J. COOK. 

